I'm glad someone else thinks the same as me,the first thing that comes to my mind when someone refers to a distributor as a "dizzy" is a 16yr old bling bling kid working on his grandmas honda.On 2006-08-16 00:37, jtfairlane wrote:
There are a number of ways to tell if your 289 is a bona-fide Hi-Po. Some have already mentioned. If you pull the valve covers, yes you want to see if you have screw in studs and cast valve spring pockets....but a good machine shop could modify a set of heads from a non hi-po 289 to have that. What you should look for is the year stamped in the head under the valve cover (ie 66) and also look for a dot. A single dot stamped in the head under the valve cover indicates a standard 289. Double dots right next to each other indicate a factory high performance head.
Other 289 hi-po parts, include a mechanical advance distributor (who the hell started using the term dizzy for distributor??? that's terrible) with dual points. If you have a vacuum advance distributor with a single point setup, that's not a hi-po.
Also, you might be inclined to believe you have a hi-po if you say the factory 4bbl intake and 4bbl carb. But the A Code non hi-po 289's got these same carbs and manifolds. If it is a hi-po, the carb should be an Autolite 4100 with 1.12 stamped on the side and mechanical choke (not automatic choke, though in 1963 I understand some hi-po's used the automatic choke). If it's an Autolite 4100 with 1.08 and not 1.12 on the side, that's also indication that it is not a hi-po.
The 289 hi-po used a solid lifter camshaft also, all other 289 cams were hydraulic.
The cast iron exhaust manifolds on a hi-po 289 have cast webbing in between the individual "tubes" and are larger in size than the straight skinny log type exhaust manifolds used on the 289 C and A codes.
The crank and counterweight was already mentioned, but what wasn't mentioned is that the rods should have 3/8" bolts instead of the smaller 5/16" found on the non hi-po's.